The error message implies that either DAM is not found in the APS.cfg or the return is NULL. It is not clear and there are no additional messages or traces.

Environment:

Release: Component: SMAPS

Resolution:

After extensive testing and comparing against similar environments, the root cause was identified.

The "error" message about APP=DAM returned NULL is not actually an error. It is the result of a misconfiguration. Specifically it was found that Password Policies were not enabled on the Authentication Scheme. So the response is firing but since Password Services are not enabled, the response is actually NULL.